Juice=Juice's leader and eldest member will be graduating at the end of Juice=Juice's Spring 2019 concert tour. She still plans to continue working in entertainment after her graduation. She's been thinking about it for a year or so, and chose the timing herself now that the new members have become familiar with the group. She wants to challenge herself and find something that makes her shine as "Miyazaki Yuka". Her future activities will be revealed at a later date.
http://www.helloproject.com/news/9678/